Replacing The Battery - Intel DQ43AP Product Manual

Intel Desktop Board DQ43AP Product Guide
7. The computer starts the BIOS Setup program and displays the BIOS Maintenance
menu.
8. Use the arrow keys to select Clear Passwords. Press <Enter> and Setup displays a
pop-up screen requesting that you confirm clearing the password. Select Yes and
press <Enter>. Setup displays the maintenance menu again.
9. Press <F10> to save the current values and exit Setup.
10. Turn off the computer. Disconnect the computer's power cord from the AC power
source.
11. Remove the computer cover.
12. To restore normal operation, place the jumper on pins 1-2 as shown below.
13. Replace the cover, plug in the computer, and turn on the computer.

Replacing the Battery

A coin-cell battery (CR2032) powers the real-time clock and CMOS memory. When
the computer is not plugged into a wall socket, the battery has an estimated life of
three years. When the computer is plugged in, the standby current from the power
supply extends the life of the battery. The clock is accurate to ± 13 minutes/year at
25 ºC with 3.3 VSB applied.
If the voltage drops too low, the BIOS Setup program settings stored in CMOS RAM
(for example, the date and time) might not be accurate. Replace the battery with an
equivalent one. Figure 23 on page 57 shows the location of the battery.
NOTE
Intel TPM uses the onboard coin-cell battery to maintain its monotonic counters. One
major function of the monotonic counters is for anti-replay protection of the internal
Intel TPM data. If the battery is removed or exhausted, the Intel TPM data will be
deleted in accordance with Trusted Computing Group guidelines. Read the Intel
Trusted Platform Module (TPM) Quick Reference Guide and back-up the Intel TPM keys
and data before removing the battery.
CAUTION
Risk of explosion if the battery is replaced with an incorrect type. Batteries should be
recycled where possible. Disposal of used batteries must be in accordance with local
environmental regulations.
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